|Year Released:||August 20, 2015|
|Shonen Jump:||JUMP NEXT Issue 2015-3|
|← N/A||N/A →|
Special Extra Chapter is a special chapter published in JUMP NEXT 2015 VOl.3 and was included in volume 3.
At the Yuunagi Gakuen, Saya's friend tells her that summer break is coming but she doesn't have a swimsuit to wear for the beach, So her friend suggest her to buy one of the skirted swimsuits. Kyousuke who overhears their conversation begins to imagine Saya in that exact swimsuit ,making his face blush,and embarrassed.
Back at the Miyoshi Detective Agency, Mako felt that she wants to go to the beach and wonder if she would buy a one-piece swimsuit. Kyousuke overhears her and begins to imagine Mako in that exact swimsuit, making his face blush as Mako wonder why Kyosuke acts so strangely.